| Portsmouth to Cividale del Friuli | 738.88 mi (1,189.12 km) |
| Portsmouth to Civita Castellana | 867.59 mi (1,396.26 km) |
| Portsmouth to Civitanova Marche | 866.68 mi (1,394.78 km) |
| Portsmouth to Civitavecchia | 856.84 mi (1,378.95 km) |
| Portsmouth to Civitella in Val di Chiana | 787.46 mi (1,267.29 km) |
| Portsmouth to Clusone | 609.41 mi (980.75 km) |
| Portsmouth to Coccaglio | 624.29 mi (1,004.70 km) |
| Portsmouth to Codigoro | 736.92 mi (1,185.96 km) |
| Portsmouth to Codogno | 632.40 mi (1,017.75 km) |
| Portsmouth to Codroipo | 725.43 mi (1,167.47 km) |
| Portsmouth to Cogoleto | 633.20 mi (1,019.03 km) |
| Portsmouth to Colle di Val d'Elsa | 767.74 mi (1,235.55 km) |
| Portsmouth to Colle Salvetti | 735.25 mi (1,183.27 km) |
| Portsmouth to Collecchio | 669.97 mi (1,078.21 km) |
| Portsmouth to Colleferro | 917.31 mi (1,476.27 km) |
